Magnetic chuck.



B. M. W. HANSON.

MAGNETIG CHUCK. APPLICATION FILED NOV. 17, 1910.

1,003,900.; P en' ied-Sept 19, 1911,

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COMPANY, OF HARTFORD,

UNITED STATES PATENT OFFICE.

anne'r m. w. HANSON, or HARTFORD, CONNECTICUT, nssreivon'ro PRATT & WHIT EY CONNECTICUT, A CORPORATION or NEW JERSEY. f

"MAGNETIC CHUCK.

To all whom it may concern: Be it known that I, BENGT M. W. HAN- SON, a citizen of the United States, residing at Hartford, in the county of Hartford and State of- Connecticut, have invented certain new and useful Improvements in Magnetic Chucks, of which the following is a specification, This invention relatesto chucks. v I

A chuck involving my invention comprises two principal sections, a primary one which is preferably connected with a source magnetic .of electrical energy and a secondary section. The primary section constitutes in effect the magnet proper of the device, and while, as intimated, it is preferably connected with a source of electrical energy, it is conceivable that the action might be obtained by a permanent magnet. The secondary section acts as an armature for the mainsection, or as a supplemental magnet,

1 in that the lines-of magnetic force traverse this secondary section and attract the work or maintain the. same rigidly thereonwhen the chuck is in action. From this observa tion it will be evident-that the. secondary section constitutes the worksupport' of he chuck, and the invention consists broa ly in abodily removable. secondary or work supporting section, and animportant advantage follows this, in that when-one secondary section is in use or in operative re= lation with the primary section, another secondary section 'may have the work mounted thereon, and. when the work on what is for the time being the operative secondary section has been finished, it'may be removed while the other secondary section with the work thereon, can be put in place on the primary section, and in this way a great saving in time can be effected.

- It w1l1 be clear that I employ the terms I ing part of thepresent specification I have primary and secondary simply asa matter of convenience, as I do not wish to convey the idea that one is subordinate to the other.

In the drawings accompanying and .formrepresented in detail a magnetic'chuclnem bodyin'g'my'invention, and the same Wil/l bB set forth' fully in the following description, so that those skilled in the art can .ractice the'i-nvention. It will-be understo how-.-v

' ever,-that I do not restrict myself to such showing, as I may depart therefrom in sevsuch as to manipulation.-

Specification of Letters Patent. Patented Sept. 19, 1911. Application filed November 17, 1910. Serial No. 592,837. I

oral respects within the scope of my invention asset forth in the appended claims, it

or separable from-the companion section.

Referring to said drawings: Figure 1 -1S .a top plan" view of said chuck. Fig. 2 is a side elevation of the same. -Fig. 3 is a 1ongitudinal section of the secondary section of the chuck, and, Fig. 4 is a similar view of the chuck showing the magnet therein.

being evident that said invention comprchends broadly the provision of a sect onal 'magnetic chuck wherein the work supporting 01' carrying section is bodily removable 6 Likecharacters refer to like parts throughout the several figures/ In the construction illustrated the primary sect-ion or body of the chuck is de-' noted by 2 and the secondary section thereof by 3. Said primary section presents the magnet proper of the chuck and in its upper --face asvillus'trated, is countersunk a series of channel-like members 4: ,of some section 2, the construction described being divide the main magnetic fieldinto. a series of sub-fields'of practically U- form. v

The secondary section 3 1s magnetizable and is represented as consisting of a plate shown provided with a downturned marginal flange 6, which incloses or surrounds the upper portion of the chuck body or primary section 2. The said upper section '3 may be provided as shown with handles 7 at the ends,- for example,

' In the present is supported on the upper surface of the secondary section, it being held thereon by magnetic action when said section is in the magnet field (or fields) of the companion section 2, it being assumed that at this time the primary section or magnet proper 2 1s energizedn The secondary or work supporting section 3- of the chuck is shown having extending transversely thereof several elongated slots Sand in said-slots are prefto facilitate its case the work erably fitted members 9; of approximately loop-form to receive the blocks 10, said blocks being rigidly connected with the members 9 in some suitable manner for inztance by tongue and groove joints, while as matter of'convenience the members 9 are similarly connected with the opposite side walls of the respective slots 8. In practice the sides of the members 9 rest on the sides of the'channeled members 4, the superficial area of the respective partsbeing in the present case equal, and to facilitate this adjustment the engaging faces of the members 2 and 3 are flat. The upper surface of the member 3 is also flat, the several members 9 and blocks 10 being in the same plane with the upper surface of said member 3, and owing to this construction, the work can be slid along the active upper face of the member 3. I

By the construction of the upper member 3 in the manner described and by which the I members 9 are in register with the parts 4 and the blocks 10 in coincidence with the blocks 5, the submagnetic fields to which I have referred are in no wise broken by reason of which I am enabled to obtain the best possible holding eflects. I might add that the magnetizable portion of the removable section 3 are the bars thereof between the slots -8.

The primary section or body 2 of the chuck incloses an ele'ctromagnet 12, the coil of which is connected with a dynamo or equivalent source of electrical energy by virtue of which when said magnet is energized a magnetic field is set up within said body, such field being divided into subfields, as it were, of approximately U-shape, by" the non-magnetizable portions of the body and removable auxiliary section to which I have already referred. It will be apparent that when this magnet 12 is energized, the

auxiliary or secondary sect on will be held in place simply and solely by magnetic attraction so as to avoid the necessity of bolts or other fastenings for such purpose.

What I claim is:

1.A magnetic chuck comprising a main section having a magnet, and a secondary section attractable by the main section when the magnet thereof is energized, said secondary section constituting the work support of the chuck, being bodily separable front-the primary section and being held in place on the main section solely by the attraction of the energized magnet.

2. A magnetic chuck comprising main section having a magnet, and a secondary section attractable by the magnet of .thc

mainsection when said magnet is energized, constituting the work support of the chuck, being also magnetizable to attract the work, being bodily separable from the primary section said secondary section bein held in place solely by the attraction of sai magnet BENGT M. W. HANSON. Witnesses:

W. A. SToRRs, LILLIAN E. Jones. 

